Poppet valve



Sept. 16, 1930. R. E. BISSELL 1,775,844

POPPET VALVE Filed Aug. 2, 1926 IIMIIIIIIIIIIIIIIII III M Q @I Wm iPatented Sept. 1 6, 1930 unrrso STATES PATENT OFFICE J RICHARD E.BISSELL,'OF CLEVELAND HEIGHTS, OHIO, ASSIGNOR T THOMPSON PROD- UCTSINC., 01: CLEVELAND, OHIO, A. CORPORATION OF OHIO POPPET VALVEApplication filed- August 2, 1926. Serial No. 126,354.

\ The invention relates to valves such as are employed in internalcombustion engines, commonly referred to as poppet? valves,

- and more particularly to exhaust valves.

expansion is greater The heat of exploded gases of internal combustionengines is very high prior to and atthe time they pass the exhaustvalves, and the valves are intensely heated thereby. Notwithstanding thefact that such valves are generally made of fine materials'with an object to withstand high temperatures without warpage, such warpage andconsequent loss of compression frequently occur. Warpage results fromthe fact that the valve head is irregularly heated at different points,result ing in irregularity of expansion, and when than the elastic limitof the metal, the original form is not restored.

Irrgularity of heating at different points of the head is of course dueto the factthat some parts lie in a zone of constantly highertemperature than others, the temperature at and velocity 1 25.

any point being dependent upon the amount of the gas passing that-pointand its proxi m1ty to the cooling medium.

' The object of my invention is to reduce this tendency to'warpage. w

This object is accomplished by equalizing the temperature of the head,by means of a ductivity than the head of higher heat conmain body of thehead.

i The relation of the metal insert to the valve head, in the preferredform of the invention metal insert in the is shown in the accompanyingdrawings, in

which Figureihis a vertical section through a valve constructed inaccordance with my inventlon, showing associated parts of the enginestructure,

provide I Fig. 2 is a top plan view of the valve, head, and

Figure3 is a fragmentary vertical sectional view through the head of amodified form of valve in which the insert is entirely enclosed by. thebody of the valve head.

In order to exemplify the principles of my invention, I have -shown avalve of well-known shape.

u'cha valve head with an insert of metal 1 fiering in characteristicsfrom the received at a metal and a process of two are flattened out andthe main body In accordance with my invention 1 main body of the head2'in that the insert is of higher heat conductivity. The recess filledby the insert may be one in the head opening from the top face ofthehead, or it may be an interior cavity as shown in Figure 3 entirelsurrounded by' the material of the head. arious materials maybe selectedfor the insert butI have found that a nonferrous metal, such as bronzecapable of withstandi-n a high temperature, serves Wellto accomplish theobject desired. It will be apparent that in such a construction the heatpoint of high temperature will be quickly conducted to other parts oflower temperature,ther eby equalizing the temperature throughout thehead.

So far as I am aware, I am the first to devise a valve head containingan insert of Such a valve and a process of constructing the same isdisclosed and claimed broadly in my co-pending application Serial N 0.126,355, filed concurrently herewith. The present application isrestricted to avalve with an insert of metal such as will attain theobjects set out above.

While the process of fabricating the valve is fully set out in' thecopending application it may be here briefly described as consisting offorming a recess in theupper end of the piece of metal which is to formthe main body of the head, inserting the high heat conducting metaltherein, and then upsetting the end in suitable dies whereby th;

0 the material is caused to partially or wholly surround and retain theinsert within the mainbody of the valve-head (Figure 3). While I havereferred specifically to but one material as being suitable for theinsert itsis obvious that many other materials are adapted to thepurpose, and it is" therefore to be understood that the disclbsureherein is merely exemplary of the principles involved and that myinvention is not confined thereto but includes all changes andmodifications falling within the scope of the appended claims.

What I claim is:

making the same.

- of greater of said head disposed in said cavity for-1n-- suring arapid conduction of heat from said head to said stem, while the valve isin use,-

piece interlocked headed member comprisinga stem, a head thereon and aflat insert in said head of, greater heat conductivity than that of saidhead interlocked with said head.

2. As an article of manufacture a twopiece interlocked headed member comrising a stem, a head thereon and an insert aving a relatively high rateof heat conductivity as compared with saidhead disposed wholly withinsaid head including a relatively thin lateral portion extending towardthe periph* eral edgeof saidhead and interlocked with the said head. i

3. As a new article of manufacture, a twopiece interlocked poppet valvehaving. a stem and a head integral therewith, said head ha ing anirregular cavity therein,-a metal insert heat conductivity than themetal said insert being bounded by -thin lateral portions extendingtoward the peripihery of said Y head and interlocked-with said ead. I

Signed by me this 22nd day of July, 1926.

I RICHARD E. BISSELL.

